Electromagnetic radiations from rocks

Ogawa, T.; Oike, Kazuo; Miura, Taiji

doi:10.1029/jd090id04p06245

Cited by 236 publications

(127 citation statements)

References 5 publications

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“…Since plastic deformation and micro-fracturing are inextricably linked, the findings of Warwick et al, Ogawa et al, and Enomoto and Hashimoto [12][13][14] were as expected.…”

Section: Introductionsupporting

confidence: 58%

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Kyriazopoulos

Anastasiadis

Triantis

et al. 2011

Construction and Building Materials

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This paper introduces the possibility of in-situ assessment of loading and remaining strength in concrete structures by means of measuring discharge of electric current from loaded specimens.The paper demonstrates that the techniques have been applied to other rock-like materials, but that for the first time they are applied to cement based materials and a theoretical model is proposed in relation to the appearance of electrical signals during sample loading and up to fracture.A series of laboratory experiments on cement mortar specimens in simple uniaxial compression, and subsequently in bending -hence displaying both tension and compression -are described and show clear correlations between resulting strains and currents measured. Under uniaxial loading there is a well-defined relationship between the pressure-stimulated current (PSC) as a result of a monotonic mechanical loading regime.Similar results are observed in the three-point bending tests where a range of loading regimes is studied, including stepped changes in loading.While currents can be measured at low strains, best results seem to be obtained when strains approach and exceed yield stress values.This technique clearly has immense potential for structural health monitoring of cementbased structures. Both intermittent and continuous monitoring becomes possible, and given an ongoing campaign of monitoring, remaining strength can be estimated.

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“…Since plastic deformation and micro-fracturing are inextricably linked, the findings of Warwick et al, Ogawa et al, and Enomoto and Hashimoto [12][13][14] were as expected.…”

Section: Introductionsupporting

confidence: 58%

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Kyriazopoulos

Anastasiadis

Triantis

et al. 2011

Construction and Building Materials

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“…We expected EMR from the main fracture of the main shock, as many results of rock experiments in laboratories showed the existence of EMR from slidings or fractures of rocks (Nitsan, 1977;Ogawa et al, 1985;Yoshida et al, 1994; and so on), but no obvious signals just at the origin time of the main shock were recorded in the VLF range.…”

mentioning

confidence: 99%

Electromagnetic Radiation Phenomena before and after the 1995 Hyogo-ken Nanbu Earthquake.

Yamada

Oike

1996

J,Phys,Earth

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Before and after the 1995 Hyogo-ken Nanbu earthquake on January 17, three kinds of phenomena of electromagnetic radiations were recorded at Uji Station, Kyoto Prefecture, Japan. They were: 1) A series of increases in number of electromagnetic noises starting from 12 days before the main shock to 2 days after the main shock, 2) A clear increase of electromagnetic noises from 5 o'clock on January 17, and 3) A co-seismic change of electric field intensity in the VLF range observed at the time of arrival of seismic waves with large amplitude, then the area around Uji Station was strongly shaken. An investigation by questionnaire about the anomalous electromagnetic phenomena before and after the earthquake was also executed after the earthquake by mailing to amateur radio operators around the focal region, i.e. those in Takarazuka, Itami and Sumoto Cities. The daily variations of the numbers of anomalous electromagnetic phenomena reached a peak just before and just after the earthquake.

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“…ルミネッセンスは，物質がエネルギーを吸収し，そのエネルギーを光や電磁波として放出する現象である．ルミネッセンスは幾つかの種類に分類でき，メカノルミネッセンスは機械的作用に伴う発光現象 (Chandra and Shrivastava, 1979; 急激な応力変化による電圧変化に起因するという報告もある (Nitsan, 1977;Ogawa et al, 1985)．また，岩石のメカノルミネッセンスは直接的な岩石自体の発光という可能性も考えられ，岩石中に含まれる可燃性ガスの影響も考えられる因子(榎本, 2010)であるのに対して，圧電現象による雰囲気ガスに起因する放電や，プラズマ化による可能性も示唆 (Lockner et al, 1983;竹内他, 1997;高木, 池谷, 1998 Variation of luminescence intensity from Quartz detected by luminescence analyzer using a photomultiplier tube and voltage from strain gage during 3-point destructive bending test. The strong luminescence intensity over 9,000 counts is observed when voltage from strain drops due to the break of the rock.…”

Section: 緒言unclassified

Investigation of a factor on the luminescence induced by a mechanoluminescence of rocks

Takakuwa

Miyasaka

Soyama

2016

Transactions of the JSME (In Japanese)

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The objective of the present study is to investigate a factor on luminescence of rock induced by mechanical action such as fracture and/or sliding. The luminescence was caused by 3-points destructive test and sliding slip test. It was observed by an electron multiplication cooled charged-coupled device camera, i.e., EM-CCD camera. The intensity of the luminescence was also detected by a luminescence analyzer employing a photomultiplier tube. In order to reveal the role of SiO 2 as a factor of piezoelectric effect, tensile strength and ambient gas plasma, SiO 2 amount was measured using X-ray diffraction analysis. The test was carried out in air, nitrogen or oxygen. In addition, a spectrum analysis was done during slide slip test to verify the role of ambient gas on the luminescence. From the obtained results, it was revealed that the luminescence appears by fracture loaded by the 3-points bending and also the sliding slip test. The spot-like luminescence can be observed by the EM-CCD camera. The luminescence intensity depends on SiO 2 amount in rocks and its tensile strength. When nitrogen is used as ambient gas, the luminescence becomes stronger. The luminescence of rock can be generated by plasma of ambient gas induced by piezoelectric effect in mechanical action, i.e., fracture and/or sliding.

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Electromagnetic radiations from rocks

Cited by 236 publications

References 5 publications

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Non-destructive evaluation of cement-based materials from pressure-stimulated electrical emission – Preliminary results

Electromagnetic Radiation Phenomena before and after the 1995 Hyogo-ken Nanbu Earthquake.

Investigation of a factor on the luminescence induced by a mechanoluminescence of rocks

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